The file refers to a compressed update package for the Nintendo Switch title Mario Kart 8 Deluxe
Here is a breakdown of what each part of the filename signifies: Mario-Kart-8-Deluxe : The title of the game. Atualizacao-3.0.3 Mario-Kart-8-Deluxe-Atualizacao-3.0.3.NSP.rar
: Addressed minor graphical glitches and gameplay inconsistencies reported in previous versions. The file refers to a compressed update package